Intraocular lens implantation - Optometry Today

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Module 3 Part 11
Multiple choice questions
Intraocular lens implantation
Please note there is only one correct answer
1. All of the following statements concerning
aphakic spectacle and contact lenses are
correct except?
a. Image magnification with aphakic
spectacles is 50%
b. Distortions with aphakic spectacles
include ring scotoma
c. Image magnification with aphakic contact
lenses is 7-12%
d. Spatial disorientation with aphakic
spectacles can be a problem
2. All of the following statements concerning
the first IOL are correct except?
a. It was manufactured from
polymethylmethacrylate
b. It was placed in the anterior chamber
c. It had a high rate of complications
d. Some patients can still be seen with these
IOLs in situ today
3. Which one of the following complications
was not seen with early anterior chamber
IOLs?
a. Corneal oedema
b. Uveitis
c. Hyphaema
d. Posterior capsular opacification
4. The main difference between modern
anterior chamber IOLs and early anterior
chamber IOLs was?
a. Material
b. Loop flexibility
c. Optic edge
d. Insertion technique
6. Which one of the following intraocular
lenses does not have a square optic edge?
a. AcrySof hydrophobic acrylic
b. Centerflex hydrophilic acrylic
c. CeeOn 911 second-generation silicone
d. Hydroview hydrophilic acrylic
7. Haptics can be made with all of the
following materials except?
a. Polypropylene
b. PMMA
c. Hypromellose
d. Polyamide
8. Binding of which one of the following
materials to the IOL surface will make the
IOL more hydrophilic?
a. Heparin
b. Silicone
c. AcrySof
d. Nitrate
9. All of the following statements about IOL
optics are correct except?
a. The lens configuration of the lens optic
may be convex plano, plano convex or
biconvex
b. Ridges in the IOL are associated with a
high incidence of PCO
c. The size of the optic varies from 4.5 to
7mm in diameter
d. A small optic may be better tolerated in
patients with large pupils
10. Advantages of foldable IOLs compared to
rigid PMMA IOLs include all of the
following except?
a. Less astigmatism
b. Cheaper
c. Usually no need to suture incision
d. Earlier stability of refraction
11. Which one of the following IOL materials
has been shown to suffer the most pits in
its optic when a Nd:YAG laser posterior
capsulotomy is performed?
a. Silicone
b. Acrylic
c. PMMA
d. Hydrogel
12. All of the following statements regarding
the refractive index of an IOL material are
correct except?
a. The higher the refractive index
the thinner the optic can be
b. Hydrophobic acrylics have a higher
refractive index than either PMMA or
silicone
c. The refractive index depends on the
dioptric power of the lens
d. IOLs with very high refractive
indices can be inserted through
smaller incisions
5. Which one of the following features is the
least important in the reduction of PCO?
a. Capsular bag placement of the IOL
b. Square optic edge
c. IOL insertion technique
d. IOL material
An answer return form is included in this issue. It should be completed and
returned to: CPD Initiatives (c2983i), OT, Victoria House, 178–180 Fleet Road,
Fleet, Hampshire, GU51 4DA by November 28, 2001.
www.optometry.co.uk
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